Phonon Lifetime of a low-dimensional Bose gas M/F
New
- FTC PhD student / Offer for thesis
- 36 mounth
- Doctorate
This offer is available in English version
This offer is open to people with a document recognizing their status as a disabled worker.
Offer at a glance
The Unit
Physique des lasers, atomes et molécules
Contract Type
FTC PhD student / Offer for thesis
Working hHours
Full Time
Workplace
59655 VILLENEUVE D ASCQ
Contract Duration
36 mounth
Date of Hire
01/06/2026
Remuneration
2300 € gross monthly
Apply Application Deadline : 20 April 2026 23:59
Job Description
Thesis Subject
This project focuses on understanding the long-time dynamics of Bose gases driven out of equilibrium, a fundamental challenge in quantum many-body physics. When such gases are quenched within their superfluid phase, the relaxation dynamics, governed by phononic excitations, may exhibit universal scaling behavior described by the Kardar-Parisi-Zhang (KPZ) equation. However, uncertainties about the phonon lifetime in low-dimensional systems remain, where standard perturbative methods are inadequate. This project aims to develop a non-perturbative framework using the Functional Renormalization Group (FRG) to derive the phonon lifetime in 1D and 2D Bose superfluids, clarifying the KPZ conjecture in 1D and generating novel predictions for 2D systems.
The student will begin by learning the FRG method and its application to close-to and out of -equilibrium quantum systems, deriving the phonon scattering rate and analyzing its scaling behavior. The results will be benchmarked against numerical simulations and existing theories to validate the approach and refine the theoretical understanding of phonon dynamics. If time allows, the project will explore the connection between phonon lifetime scaling and the KPZ universality class, comparing FRG-derived results with experimental data.
Expected outcomes include a non-perturbative description of the phonon lifetime, clarification of the KPZ scaling in 1D, and new predictions for 2D superfluids. This project, which may extend into a PhD thesis, offers the opportunity to work at the forefront of quantum field theory and non-equilibrium physics, with potential applications in quantum technologies.
This project is in collaboration with the theory group of Nicolas Cherroret at Laboratoire Kastler-Brossel, Sorbonne Université.
Your Work Environment
The PhD will be carried out under the supervision of Adam Rançon at the PhLAM Laboratory of the University of Lille. The student will join the Quantum Systems team at PhLAM. The PhD is supported by ANR funding, which will enable participation in physics schools and international conferences.
Compensation and benefits
Compensation
2300 € gross monthly
Annual leave and RTT
44 jours
Remote Working practice and compensation
Pratique et indemnisation du TT
Transport
Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€
About the offer
| Offer reference | UMR8523-ADARAN-004 |
|---|---|
| CN Section(s) / Research Area | Atoms and molecules, optics and lasers, hot plasmas |
About the CNRS
The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.
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